Is Tile Shop the fastest-growing specialty building product retailer in the country? Or does it just seem like it?

In the span of a month, Tile Shop locations cropped up in Tulsa, Danbury, San Antonio and Oklahoma City. And since it went public in August 2012, the Minneapolis-based retailer has been expanding aggressively. Twenty stores opened in 2013, debuting in new markets amid a beefed-up corporate infrastructure.